The Michigan Department of Transportation (MDOT) is responsible for Michigans nearly 10,000-mile state highway system, comprised of all M, I, and US-routes. When the paving operation is discontinued, a transverse joint must be constructed. Further, whenever rigid extensions are employed, the strike off, or pre-strike off, assembly must be added to the extension and set at the same location as the strike off on the main screed. Once these forms are complete, all pertinent information needs to be entered into the Statewide Warranty Administration Database (SWAD) and letters sent directly to the contractor and directly to the Surety Company notifying them of the results of the inspection and status of the warranty prior to the expiration date. This check is done by roughly measuring the area covered by one truckload; the tonnage placed is known from the load ticket. If the normal paving speed is fast, or the truck exchange is slow, it will be better to stop the paver when the transfer of trucks occurs. R1-6 Gateway Treatment Flexible Pavement: These adjustments are based upon the mixture acceptance test results and the pavement in-place density, and are explained in the contract special provisions. endstream endobj This information helps the department identify congested areas, when congestion occurs and how often, cause of delay, and more. A rule of thumb is that the proper level of air voids should be obtained before the mixture cools to a temperature of 176F. The faster the paver moves, the less time the screed sits over any particular point in the new mat, thus the amount of compactive effort applied by the screed decreases. The tiers identified below apply to Superpave The surface can have two types of waves: long waves and short waves. As the first load of mixture is being spread, the texture of the unrolled surface should be checked to determine uniformity. Changes occur because of material supply, equipment breakdown, Contractor and Subcontractor schedules and weather conditions. Bulletin include test data for all coarse and fine Aggregate used in Maryland Highway construction. This is a certified product and the suppliers must be on the Certified Products List. See Figure 502-2. Another type of grade referencing device is the joint matching shoe. Unsere Bestenliste Jan/2023 Detaillierter Produktratgeber TOP Grey goos vodka Aktuelle Angebote Vergleichssieger Direkt weiterlesen. One make of paver, however, is equipped with a power extendable screed that places the extendable portion of the screed in front of the main screed. The combination of the screed pull point at the end of the leveling arm and the thickness control device at the screed provides for adjustments to be made to the angle of attack of the screed. MDOT Microstation Workspace Instructions, Asset Management Guide for Local Agency Bridges in Michigan Once the truck bed has been emptied of mix, the truck hitch is withdrawn and the truck is able to pull away from the paver. The important part to remember is that although it rolls slower than a static roller, the vibratory machine can usually economically reach specified density with fewer passes. Design There are two basic types of asphalt mixing plants. Phone: 443-572-5045 Fax: 410-787-0483 Email: TDavis5@mdot.maryland.gov Admixtures for Concrete Admixtures for Concrete Product Qualification Procedures (PDF, 200 KB) Qualified Products Air Entraining Agents (PDF, 200 KB) Drycast Admixtures (PDF, 200 KB) Precast Admixture (PDF, 200 KB) Type A - Water Reducing (PDF, 200 KB) The uniformity of the roller passes is just as important as the number of passes. Depending upon the gate settings, more or less mixture is permitted to enter the tunnel. Whenever a rigid screed extension is employed on the basic screed, auger extensions and the accompanying auger tunnel extensions should also be added. Typically, the string is supported on metal posts at 25 foot intervals. HMA mixtures consist of a blend of asphalt binder and aggregates mixed in an asphalt plant. The first yield check should be made as soon as the Contractor has completed all paver adjustments. It is important that the individuals in daily charge of the project for both MDOT and the Contractor meet periodically, both on a formal and informal basis, to discuss the progress and quality of the work done to date and the progress schedule for the future. Keeping the hopper at least half full between truckloads of mix keeps the head of mix in front of the screed constant and this will reduce mat problems. The tractor unit provides the motive power to the paver and to transfer the mixture from the receiving hopper on the front of the paver to the spreading augers at the back of the paver. This requires that the supervisory personnel define the tasks, authority and responsibilities of each of the key individuals to be involved in the work. The temperature should be checked immediately. There are four basic types of grade references that can be employed to maintain the elevation of the screed pull point: the erected string line, the mobile mat reference, 30 foot floating ski, and the joint matching shoe. Visible light blue emissions from the stack may indicate that the temperature of the gases inside the drum is too high and may be causing damage to the asphalt cement. The paver should be brought from paving speed to a stop as quickly and as smoothly as possible without jerking the paver. Requesting a ProjectWise Folder, Ryan Doyle, P.E., Supervisor, 989-220-9447, Michele Zawerucha, Project Development Engineer, 517-335-0878, Urban Area Staff Engineer Contact Information, Instructions for Preparing to Bid Federal Aid Projects Through MDOT b. Screed plates first wear out about four to six inches from the trailing edge. The applied amplitude is determined by the location of the eccentric weights that are located on the shaft. Fat spots can be caused by high moisture in the mixture; if the mixture is very hot, asphalt could run down to the bottom of the truck during transport and cause fat spots when dumped into the paver. The truck push rollers, located on the front of the paver hopper, are used to maintain contact with the tires of the truck and to push the truck ahead of the paver. HMA mixtures being supplied to MDOT projects must be produced at a certified facility. Ensure existing surface failures are repaired properly. To exceed this one impact or more per inch of travel may produce small ripples in the mat when laying HMA. These tools include rakes, shovels, lutes, 10 foot straightedge, carpenters level and blocks and shims for supporting the screed of the paver when beginning operations at a butt joint. The web Browser you are currently using is unsupported, and some features of this site may not work as intended. This document replaces the previous edition of the guidance, published in 2009. Improper adjustments of catch basins can create drainage problems, which will lead to early deterioration of the roadway. 1 0 obj This skirt will help keep the tires hot by holding the heat from the mix under the roller. Included are examples of calculations, documentation requirements, and contact information for MDOT and private testing laboratories. This type rollers compactive effort is a function of the wheel load, the tire pressure, the tire design and the depth of penetration of the tires into the mix. One side of the paver is controlled by the grade referencing sensor and the other side is controlled by the slope controller. 3 0 obj The rolling zone should be kept as short as possible. You may also contact Ryan Doyle at DoyleR3@Michigan.gov. Public Notice of Superior Region Bridge Council Meeting for September 23, 2022 The aggregates are then proportioned by weight into the mixer, also called the pug mill. Moved Permanently. This article returns the responsibility for these tasks to MDOT for all CPM surface seal projects, including those that contain 03SP505A, 03SP507A, 03SP508A, or 03SP508C. When a change in one force occurs, the screed will rise or fall and will change the thickness of the mat being placed. It is the MDOT inspectors responsibility to ensure that the Contractor is providing a specification product. If a hydraulically extendable screed is being used with the paver, the crown can be introduced in the center of the main screed and also at the points between the main screed and the hydraulic extensions. DZs}9{,dp ^E3 `E%)eNDL-F1>tcf^cs\3WCwn}YI.kaz1r LX[t6*4u*QEI^:RG3iiv=I ->6{mU=CKGuK'b Material from the existing surface is milled out to a depth as shown on the plans, or equal to the top course, across the entire width of the joint and to a length of 35 feet minimum. Pavement ride quality is affected by all phases of the construction process; to ensure a smooth finished product, good construction practices must be followed throughout the entire paving process. Adequate compaction of the mix increases the pavement life, decreases permanent deformation, reduces oxidation or aging of the asphalt binder, decreases moisture damage, increases strength and stability and decreases low temperature cracking. This equipment must be safe, environmentally acceptable and capable of producing a specification product. This can be accomplished by using a rotary broom, flushing with water, and other methods that may be required to remove clay and dirt. This unit is responsible for the development of statewide processes for the implementation of all required state and federal regulations as it relates to local agencies. All mixtures specified for a project must have an approved mixture design before mix production can proceed. Our goal is to keep Michigan's motorists safe, informed, and mobile. Mountain Standard Time is the second westernmost time zone in the United States and Canada. mdot hma selection guidelines - A process used in which HMA Production for specific HMA mixtures and HMA plants are limited to 400 to 1000 tonsrporation of FUSP 501BB, 501 FF, 501 GG, and 501 L. Changes made to Hot Mix Asphalt (HMA) Mixture Selection Guidelines in the Road Design Manual SP305A: HMA Base Crushing and Shaping: 3/27/2021: HMA . The faster a roller passes over a point on the asphalt surface, the less time the weight of the roller has to work on that point; this means that less compactive effort is applied to the mixture. Resources for MDOT real estate standards, policies and procedures, and training. Attach copies of the qualification documentation for the sampling technician to the preproduction meeting minutes for each HMA paving project where HMA sampling is required. This includes, at a minimum, staff oversight at a level to perform periodic on-site inspections. Nonuniform mixing shows up as spots of lean, brown, and dull appearing material within areas of rich and shiny appearance. 2 0 obj All horizontal and vertical surfaces that will be in contact with the new HMA mixture must be thoroughly cleaned. Once it is determined how many passes are needed to achieve compaction at any point, the roller pattern for an area will be calculated by multiplying the number of roller passes needed for compaction by the number of rollers needed to cover the width being paved. One of the greatest contributors to a poor ride on an urban project is the improper adjustment of manholes. It spans from northern Canada to Mexico near the equator. Laying out core locations, discuss how it will be done. FY 2023 Project Planning Guide The three essential requirements of a bond coat are: Excess bond coat may create a slip plane between courses, bleed into the overlaying course and cause flushing. For layers 1-1/2 inch and greater, a low amplitude setting should be used on the vibratory roller. This page was last edited on 13 January 2022, at 11:41. A vibratory compactor should never exceed a rolling speed that will provide less than one impact of the drum per inch of travel. If the depth exceeds the plan thickness by 2 inches, the Contractor must fill in the butt joint to the required thickness. 115 0 obj <<4c7790beb010dcdd18f2ce7848bb2f38>]>>stream MDOT provides technologies and partnerships in order to make the transportation system safer and less congested. Be extremely careful when an asphalt surface is being placed on an aggregate base adjoining a slab or curb. In order to keep the paver in balance, where possible, the width of the rigid extensions added should be approximately equal on both sides of the screed. Non-biodegradable agents that dissolve the HMA mixture, such as fuel oil, shall not be used at the paving site. U@A#8TEtAr]wWxazj+%=[,dM,MAg/z{F }G=lNPjeG&Pku,T]cXQo &gnXKIZEmCK0&9?l 1l| 3]B]C*hv K65 Refer to Figure 502-13 for some typical mat appearances. Do extensions have approved method of heating? Rollers are used to compact the mixture to the required density. A specified number of samples are to be taken from each sublot. It is very important to know what special provisions are contained in the proposal. An asphalt mix that has all the desirable mix design characteristics will perform poorly, if not compacted to the proper density. Any questions about the information in the contract documents should be raised and clarification requested, if necessary. Trucks should stop short of the paver and be picked up by the paver. The tractor unit receives the asphalt mixture from the haul trucks, carries that mixture back to the spreading augers, distributes the mixture across the width of the screed and pulls the screed over that mixture. Aggregate of different sizes should be stockpiled separate from one another. The Bureau of Bridges and Structures is responsible for statewide policy, procedure development, and execution to ensure all bridges and structures are designed, constructed, maintained, and operated to ensure safety. No matter what type of plant is being used, several key items should be monitored. On structures in the curb line out of the traveled roadway, the top of the cover should be 3/8 inch (8 mm) below the wearing surface after final compaction is completed. 4.4 MDOT Standard Practice for Random Sampling of HMA Materials 4.4.1 Sampling In-Place Paving Material 4.5 Utilizing Reclaimed Asphalt Pavement (RAP) Millings from the Same Project When Using a Portable Hot Mix Asphalt (HMA) Plant GENERAL Pre-Production Meeting A pre-production meeting should be held before work commences on a project. Ride Specification provides guidance to using the Pavement Surface Profile. The hitch is controlled by the paver operator. %PDF-1.5 % Things to look for during the paving operation include: The trucks should be loaded in multiple drops. Cutoff shoes can be used, if necessary, to reduce the width of mixture being placed to a width that is less than the basic main screed width. In addition to the longitudinal mark, a mismatch in the elevation between the two screeds can also result in a possible difference in surface texture. Is heating system in good working condition? If it falls at the free edge of the pavement, the core location should be moved 2 inches in from the edge. A result of specified mix contaminated with inferior performing, non-specification mix. If the surface of the mat is cooling much faster than the mixture under it, the surface will check as the hot mix is compacted. See Figure 502-7. The United States Department of Transportation (USDOT) DBE size cap found at 49 C.F.R. The desired degree of cross slope is dialed into the slope controller. The good looking surface texture can lull the operator into a false sense of security. Some pavements may be disintegrated so badly that the fragments may have to be removed. MDOT's commissions, councils, task forces, and partnerships are responsible for establishing policies, supervising programs, overseeing state and federal funds, providing recommendations and advisement, and acting as a resource. This is caused by an improperly adjusted screed angle of attack. t6h ($Y+q Steam rising from the mix as it is dumped into the hopper of the spreader indicates moisture in the mix. The aggregate used to make the mix can be a single aggregate, but it is generally different sizes blended together through the cold feed bins to produce proper gradation. The MDOT procedure used for selecting random core locations is by using a random number generating computer program. The rollers behind the first paver should stay 1 foot away from the free edge toward the second paver. A new plant inspector can easily get burned if not aware that asphalt samples are very hot. 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